What is the meaning of Platinum?

The chemical element with atomic number 78 and symbol Pt; a dense, malleable, ductile, highly unreactive, silverish-white transition metal of great value.

A whitish grey colour, like that of the metal.

A single or album that has achieved platinum sales, i.e. over 1 million or 2 million.

A platinum-based drug: a platin.

Of a whitish grey colour, like that of the metal.

Of a musical recording that has sold over one million copies (for singles), or two million (for albums).

Very expensive, or of very high quality

To attain all of the achievements in a game, on certain PlayStation consoles.

platinum; made from platinum

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A part of platinum

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Source: wiktionary.org